Screening apparatus.



No. 627,706. Patented June 27', I899. n. E. PHILLIPS.

SCREENING APPARATUS.

(Application filed. Feb. 20, 1899.) (No Model.) 2 Sheets-Sheet l.

No. 627,706. Patented June 27, I899.

D E PHILLIPS SCREENING APPARATUS.

(Application filed Feb. 20, 1899.]

2 Sheets8heet 2.

(No Model.)

MIMI

' to the opposite sides of the screen.

NITED STATES ,ATENT Fries.

DAVID E. PHILLIPS, OF MAHANOY CITY, PENNSYLVANIA.

SCREENING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 627,706, dated June 27,1899.

Application filed February 20, 1899. Serial No. 706,169- (No model.)

To all whom it may concern:

Be it known that 1, DAVID E. PHILLIPS, a citizen of the United States,residing at Mahanoy City, in the county of Schuylkill and ends.

In the accompanying drawin gs, which illustrate my invention, Figures 1and 2 are side views of my improved screening apparatus in its simplestform, illustrating the operation of the same, one of thesupporting-timbers and the bearings being removed. Fig.

3 is a transverse section on the line 3 3 of Fig. 1, and Fig. 4: is aside view of the apparatus arranged to deliverthe screened material atboth ends.

Referring to Figs. 1, 2, and 3 of the drawings, 1 and 2 indicate upperand lower screens, each, as shown, consisting of a perforated plate 3,supported along its sides by angleirons 4, which form the sides of thescreen.

The perforated plate may be flanged on the sides and bolted to theangle-iron through these flanged sides instead of through the bottom, asshown in the drawings. Each screen is supported upon rods 5,which extendtransversely beneath the screen at convenient intervals, these rodsextending through suitable depending plates'or brackets 6, attached Therods 5 are preferably made square or otherwise angular in cross-sectionthroughout the major portion of their length, and the openings 6 in thedepending brackets areof corresponding shape, as shown .in the lowerpart of Fig. 2, so that the rods are prevented from turning. The ends ofthe rods projecting beyond the sides of the screen are turned to formbearings, upon which are pivotally mounted a series of supporting-links7, having suitable openings near their ends, adapt= ed to pass over saidbearings. The screens are thus connected together by thesupporting-links, the corresponding rods of each screen being connectedby a pair of links. The number of pairs of links employed will of coursedepend upon the f length of the screens. Eachlink is provided with acentral bearing 8, and each pair of links is mounted upon a separateshaft extending transversely between'the screens and through saidbearings. As shown in Figs. 1 and 2, there are three such shafts 9, 10,and 11, arranged at successively-increasing heights above the horizontalbeams 12, upon which the shaft ends are supported, thus'giving a properinclination to the screen-s. The central shaft 10 is the'driving-shaft,and it is mounted in suitable bearings 13 and provided with adriving-wheel 14. The shafts 9 and 10 may be either stationary or theymay be mounted in bearings, so as to rock with the links, if it isdesired to secure the links to said shafts, and instead of mounting thecentral links upon the driving-shaft I may journal them upon stationarysleeves connected with the bearings 13, so as to avoid wear by theshaft.

A pair of cams or eccentrics 15 are keyed or otherwise suitably securedto the drivingshaft just inside or, if desired, outside of the links 7,these cams being similarly arranged with reference to the shaft, andsurrounding each of these eccentrics is a guide-block 16,

having a circular opening adapted to receive the eccentric. Eachguide-block is-provided at either side of the circular opening withparallel guideways 17, Fig. 3, extending through the block and adaptedto receive a pair of standards 18, which are secured to the upper screenin any suitable manner. As shown in the drawings, the standards are eachformed with a wedge-shaped upper end 19, adapted to fit within atapering opening in a lug 20, secured to the side of the screen. Eachpair of standards is rigidly held against'longitudinal movement by abrace 19, suspended 7 j A El 1 from the rods 5 of the upper screen oneither side of the standards and having its central portion connectedwith the free ends of the standards projecting through the guideways.

The operation of the apparatus will be readily comprehended from aninspection of Figs. 1 and 2, which represent the screen in differentpositions. When the driving shaft is turned, the revolution of theeccentrics will carry the guide-blocks alternately from right to left,and the latter through the medium of of the standards will rock theupper screen in a corresponding manner, while the lower screen will besimultaneously moved in the opposite direction through the medium of thelinks, as indicated in Fig. 2. In passing between the extreme right andleft hand positions the cam-block will move vertically upon thestandards and there will be a slight vertical movement of the latter asthe screens rock upon the shafts. The change in the direction ofmovement of the screens is accomplished gradually by the cams, and itwill be noted that the strains upon the driving-shaft in a directionparallel with the screens, due to the inertia of the screens to beovercome in stopping or starting, are always equal and opposite indirection to the strains from the same cause on the shafts 9 and 11combined.

The shafts being all mounted upon continuous beams, the opposing strainsare neutralized therein and no deleterious vibration results.

In Fig. at I have shown an arrangement in which the screening anddelivering capacity of the apparatus is doubled and in which thebalancing of the apparatus is perfectly maintained. In this instance thescreens are of double length and inclined in opposite directions fromthe central point. The chute 21, which delivers the coal to theapparatus, is located over the central point of the upper screen, sothat the unprepared coal is delivered equally on each half 22 and 23 ofsaid screen, the finer material dropping through onto the correspondinghalves 24 and 25 of the lower screen. Chutes 26 are arranged at theopposite ends of each screen for conveying the prepared coal to the carsor coal-bin. The general construction and operation are the same as inFigs. 1, 2, and 3. This double arrangement of the screens may be used toadvantage in many instances and is a valuable feature of my invention.When the sides 22 and 25 are traveling in a direction opposed to thedescending coal, the sides 23 and 24 are traveling with the coal 011said screens, and vice versa, and the balance of the apparatus ismaintained.

While I have shown the driving apparatus connected by means of thestandards and guide-blocks with the upper screen, it will be understoodthat the standards may be con-' nected with thelower screen instead,also that the driving-shaft may be located elsewhere than in the centralpart of the apparatus, and

tween and pivotally connected with said screens, of a driving-shaftprovided with a cam, a guide-block operated by said cam, and having ag-uideway, and a standard secured to one of said screens, and extendinginto said guideway, substantially as described.

2. The combination with upper and lower screens, and supporting-linksfulcrumed between and pivotally connected with said screens, of adriving-shaft provided with a cam, a guide-block operated bysaid cam,and having guideways on either side of the shaft, and a pair ofstandards secured to one of said screens, and extending into saidguideways, substantially as described;

3. The combination with upper and lower screens, and supporting-linksfulcrumed between and pivotally connected with said screens, of adriving-shaft, provided with a cam, a guide-block operated by said camand having guideways, standards secured to one of said screens, andextending through the guideways, and a brace-rod connected to saidscreen on either side of the standards, and engaging their free endssubstantially as described.

4. The combination with upper and lower screens, and supporting-linksfulcrumedbetween and pivotally connected with said screens, ofadriving-shaft, extending between and transversely of said screens, apair of cams on said shaft, guide-blocks operated by said cams, andhaving guideways, and standards secured on either side of one of saidscreens and extending into said guideways, substantially as described.

5. The combination with upper and lower screens and supporting-linksfulcrumed between and pivotally connected with said screens, of adriving-shaft arranged transversely between the screens and midway oftheir length, said shaft forming a support for the central pairof links,and means operated from said shaft for reciprocating the screens,substantially as described.

6. The combination with'upper and lower screens, each having its endsoppositely inclined from the central point,and supporting-linksfulcrumed between and pivotally connected with said screens, of adrivingshaft extending between and transversely of said screens, cams onsaid shafts, guideblocks operated by said cams and having guideways, andstandards secured to one of said screens and extending into said guideways.

7. The combination with upper and lower screens, supporting-linksfulcrumed between ards secured to one of said screens and ex= andpivotally connected with said screens, tending into said guideways. IOparallel continuous beams and shafts am In testimony whereof I aflix mysignature ranged transversely thereof upon which said in presence of twowitnesses. V links are fulcrumed, a driving-shaft sup- DAVID E;PHILLIPS.

ported upon said beams, said shaft being pro- WVitnesses:

vided with a cam, a guide-block provided JNO. W. PHILLIPS, withguideways upon said cam, and stand FRANK F. REED.

